<div class="row">

  <div class="col-md-3" *ngFor="let s of sl">
    <div class="card" >
      <img src="{{s.cover}}" class="card-img-top" alt="...">
      <div class="card-body">
        <h5 class="card-title">{{s.title}}</h5>
        <p class="card-text">{{s.description}}</p>
        <a  class="btn btn-primary" (click)="goToDetail(s.singlepageid)">查看详细</a>
      </div>
    </div>



  </div>






</div>
